Bug 1472955 - DWARF5 support in readelf
Summary: DWARF5 support in readelf
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: binutils
Version: 7.5
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Nick Clifton
QA Contact: Miloš Prchlík
Vladimír Slávik
URL:
Whiteboard:
Depends On:
Blocks: 1471969 1472966 1472969 1472971 1472978 1472979
TreeView+ depends on / blocked
 
Reported: 2017-07-19 16:29 UTC by Ben Woodard
Modified: 2018-04-10 10:00 UTC (History)
8 users (show)

Fixed In Version: binutils-2.27-10.base.el7
Doc Type: Enhancement
Doc Text:
Improved DWARF 5 support in various tools Support for the DWARF debugging format version 5 has been extended in the following tools: * The `eu-readelf` tool from the _elfutils_ package now recognizes all DWARF 5 tags and attributes. * The `readelf` and `objdump` tools from the _binutils_ package now recognize the DWARF 5 tag `DW_AT_exported_symbols` and correctly report its presence in debug information sections.
Clone Of:
: 1472966 1472969 1472978 1496220 (view as bug list)
Environment:
Last Closed: 2018-04-10 09:59:05 UTC
Target Upstream Version:

Attachments (Terms of Use)
clang compiled object that includes the example above (45.27 KB, application/x-object)
2017-07-19 16:29 UTC, Ben Woodard 		no flags Details
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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0686 0 None None None 2018-04-10 10:00:54 UTC
Sourceware 20755 0 None None None 2017-07-19 17:44:04 UTC

Description Ben Woodard 2017-07-19 16:29:29 UTC 
Created attachment 1301240 [details]
clang compiled object that includes the example above

Description of problem:
We are starting to use Clang 4.0.0 at LLNL and it is emitting some DWARF5 opcodes. Please backport DWARF5 decoding to RHEL's binutils.

For example:
#include <string>
#include <vector>

std::vector<std::string> var;

and tangentially I saw something in the DWARF which neither readelf or eu-readelf understands.

<2><7e1>: Abbrev Number: 23 (DW_TAG_namespace)
    <7e2>   DW_AT_name        : (indirect string, offset: 0x15c): __cxx11
    <7e6>   DW_AT_decl_file   : 1
    <7e7>   DW_AT_decl_line   : 2214
    <7e9>   Unknown AT value: 89: 1

probably a rebase is too dangerous and the changes haven't even landed in 2.28 yet. However, since clang is already emitting some DWARF5 we should at least be able to decode what it is emitting reliably.
Comment 2 Nick Clifton 2017-07-20 09:36:41 UTC 
Hi Ben,

  Unfortunately this request has arrived too late to be included into RHEL 7.4.
  I will make sure however that the RHEL 7.5 binutils does contain the required
  patch.

  In the meantime you might want to consider using the soon-to-be-released
  Developer Toolset 7 for RHEL 7.4, as I have patched those sources as well.

Cheers
  Nick
Comment 3 Nick Clifton 2017-08-09 12:35:08 UTC 
The fix has now been added to the RHEL-7.5 binutils branch.
Comment 6 Nick Clifton 2017-12-05 15:09:57 UTC 
Hi Vladimír,

  Looks good to me. :-)

Cheers
  Nick
Comment 8 Miloš Prchlík 2018-02-01 08:59:01 UTC 
Verified with binutils-2.27-9.base.el7.
Comment 11 errata-xmlrpc 2018-04-10 09:59:05 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0686
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